/Engine/Source/Developer/Localization/Public/LocTextHelper.h
This requires that the given culture is is in the native culture, or in the list of foreign cultures set during construction.
True if the file was saved, false otherwise.
bool SaveArchive ( const [FString](API\Runtime\Core\Containers\FString) & InCulture, [FText](API\Runtime\Core\Internationalization\FText) * OutError ) const